Tower

The tower is defined similar to the blade.

    tower:
        outer_shape_bem:
            reference_axis: &id003
                x:
                    grid: [0.0, 0.10047454902385111, 0.20094909804770222, 0.30142364707155334, 0.40189819609540445, 0.5023727451192556, 0.6028472941431067, 0.7033218431669578, 0.8037963921908089, 0.90427094121466, 1.0]
                    values: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
                y:
                    grid: [0.0, 0.10047454902385111, 0.20094909804770222, 0.30142364707155334, 0.40189819609540445, 0.5023727451192556, 0.6028472941431067, 0.7033218431669578, 0.8037963921908089, 0.90427094121466, 1.0]
                    values: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
                z:
                    grid: [0.0, 0.10047454902385111, 0.20094909804770222, 0.30142364707155334, 0.40189819609540445, 0.5023727451192556, 0.6028472941431067, 0.7033218431669578, 0.8037963921908089, 0.90427094121466, 1.0]
                    values: [15.0, 28.0, 41.0, 54.0, 67.0, 80.0, 93.0, 106.0, 119.0, 132.0, 144.386]
            outer_diameter:
                grid: [0.0, 0.10047454902385111, 0.20094909804770222, 0.30142364707155334, 0.40189819609540445, 0.5023727451192556, 0.6028472941431067, 0.7033218431669578, 0.8037963921908089, 0.90427094121466, 1.0]
                values: [10.0, 10.0, 9.926, 9.443, 8.833, 8.151, 7.39, 6.909, 6.748, 6.572, 6.5]
            drag_coefficient:
                grid: [0.0, 1.0]
                values: [0.5, 0.5]
        internal_structure_2d_fem:
            outfitting_factor: 1.07
            reference_axis: *id003
            layers:
               -  name: tower_wall
                  material: steel
                  thickness:
                      grid: [0.0, 0.10047454902385111, 0.20094909804770222, 0.30142364707155334, 0.40189819609540445, 0.5023727451192556, 0.6028472941431067, 0.7033218431669578, 0.8037963921908089, 0.90427094121466, 1.0]
                      values: [0.039496, 0.039496, 0.033416, 0.034142, 0.030242, 0.031174, 0.027028, 0.027398, 0.02062, 0.021032, 0.026964]

reference_axisObject

The field reference_axis describe the three-dimensional shape of the reference axis of the tower via three sub-fields, namely x, y, and z. The three sub-fields contain the pairs of arrays grid and values. The former is nondimensional, while the latter is expressed in meters. x, y, and z are expressed in the tower reference system, with x parallel to the ground pointing downwind, y parallel to the ground and to the rotor plane, and z perpendicular to the ground pointing upwards. Standard towers are only defined along z.

outer_diameter.valuesArray of floats, m

Diameters of the tower defined from tower base (grid = 0) to tower top (grid = 1).

drag_coefficient.valuesArray of floats

This is the equivalent drag coefficient used to compute the aerodynamic forces generated by the tower immersed in the flow. Standard aeroelastic solvers use this parameter.

outfitting_factorFloat

Multiplier of tower mass to account for the mass of the auxiliary systems, such as stairs, elevator, paint, etc. This can be used to convert the mass of the steel cylinders to the total mass of the tower.

The field layers mimic the same field of the blade.